the problem with teaching yourself guitar (or any instrument) is that alot of people give up they get frustrated. (supposedly 90% of self taught musicians quit whilst quoting statistics are generally wrong i wouldn’t put it past being a damn high figure)
also alot of people can ”play” guitar, ie bang out a few songs & intros eg starirway to heaven. But there is a notable difference heard between a self-taught guitarist playing a song & a trained guitarist.
guitarists are a dime a dozen, everybody plays guitar (heck i play guitar) however a decent guitarist is hard to find this is where you can benifit from lessons as most people don’t take lessons.

Lessons are definitely a great idea, a teacher can show you techniques & correct you. i still get corrected over things i do at my lessons.
alot of the internet resources aren’t that great, again it is alot of amateurs with bad technique posting who started out similar to you, or looking to make a quick buck.

every music autobiography i have read (& i read quite a fair bit of them as i LOVE music) the guitarist/any instrument, has gotten lessons at some point.
there are a rare few virtuoso (ie talented) people who didn’t get lessons but even at that they start practicing with other people who have got lessons & learn off them.
As somebody said those ”guitar for dummies” are great, however that is as a side tool to reference to. not to just teach yourself, at a glance you learn the basics but when you study those books they can get quite complicated & a teacher can clear any questions you have.
a teacher also encourages you to practice & gives you set goals.
Don’t get me wrong you can learn by yourself but if you are in any way serious about wanting to play music & want to get to a good level, i’d DEFINITELY suggest lessons. Also alot of people seem to start their music career out on guitar as it is such a famous instrument & lots of people own guitars in some form. Don’t be suprised if you feel like quitting guitar because everybody plays it after a few months it happens to alot of people, it doesn’t mean you aren’t musically talented.

PS try not to ask people to give you the chords to a song, its better if you can work them out yourself it creates an ear for certain notes. however make sure what you are playing is correct.
PPS: i read here an answer off somebody who was in a music college, she roughly said ”the teachers would cringe when they heard that a new ’self-taught’ musician was coming to the colllege, because the teachers all knew he/she would have to be retaught due to them having bad technique”

Rory Gallagher- Walk On Hot Coals (ROCK, the 5 minute solo isn’t as good as the ”irish tour” solo, but jesus christ this rules & it highlights the bands chemistry)

”Rory’s death really upset me. I heard about it just before we went on stage, and it put a damper on the evening” Jimmy Page (Led Zep)

Sources: bassist
experience in music (ie reading books, being out there etc)